AC/DC multi-axis accelerometer for determining patient activity and body position
First Claim
1. A cardiac stimulation device comprising:
- means for sensing activity level and body position and for generating signals indicative of activity level and body position of a patient'"'"'s body; and
a controller that is adapted to be coupled to the means for sensing to receive the activity and position signals, wherein the controller is operative to process the activity and position signals to determine a standing position during an initial phase, and that, in a subsequent phase, is operative to compare the activity and position signals with the determined standing position to determine a patient position.
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Accused Products
Abstract
An implantable cardiac stimulation device which determines stimulation based upon the patient'"'"'s body position and activity level while eliminating special implantation or calibration procedures. To eliminate such special implantation and calibration procedures, the stimulation device correlates the patient'"'"'s body position using a multi-axis DC accelerometer or other sensor during times of high activity and determines a patient'"'"'s standing position value. During other times, the stimulation device compares the signals from the accelerometer to the standing position value to determine the patient'"'"'s current body position. Based upon the current body position and the activity level, the stimulation device determines the necessary stimulation to deliver to the patient.
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Citations
18 Claims
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1. A cardiac stimulation device comprising:
means for sensing activity level and body position and for generating signals indicative of activity level and body position of a patient'"'"'s body; and a controller that is adapted to be coupled to the means for sensing to receive the activity and position signals, wherein the controller is operative to process the activity and position signals to determine a standing position during an initial phase, and that, in a subsequent phase, is operative to compare the activity and position signals with the determined standing position to determine a patient position. - View Dependent Claims (2, 3, 4, 5)
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6. An implantable cardiac stimulation device, comprising:
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a sensor that senses body position of a patient; a detector that detects when the patient is in an active state; a signal processing circuit, coupled to the sensor and the detector, that automatically measures the patient'"'"'s body position when the patient is detected in the active state and generates a standing position value based on the measured body position; a memory that stores the standing position value; and a controller, coupled to the detector, the memory and the pulse generator, configured to determine a current body position of the patient relative to the stored standing position value, and further configured to adapt a stimulation therapy based upon the patient'"'"'s current body position. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A cardiac stimulation device comprising:
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at least one sensor that is operative to sense activity level and body position and further operative to generate signals indicative of activity level and body position of a patient'"'"'s body; and a controller that is adapted to be coupled to the at least one sensor to receive the activity and position signals, wherein the controller is operative to process the activity and position signals to determine a standing position during an initial phase, and that, in a subsequent phase, is operative to compare the activity and position signals with the determined standing position to determine a patient position. - View Dependent Claims (15, 16, 17, 18)
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Specification